Lack Of Power, Sluggish Or Spongy

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2000 Isuzu VehiCROSS, 2000 Isuzu Trooper, 2000 Isuzu Rodeo, 2000 Isuzu Hombre, and 2000 Isuzu Amigo. However, it is still accessible from the selected car via links, so may be relevant.

Check restricted air filter
Check ignition system.
Check for faulty PCM and grounds.
Check ignition timing.
Check knock sensor system for excessive retard.
Check for faulty Torque Converter Clutch.
Check for contaminated fuel.
Check fuel pressure.
Check for restricted fuel filter.
Check EGR system.
Check for restricted air filter.
Check for faulty throttle position sensor.
Check for faulty MAP sensor.
Check oxygen sensor for silicone contamination from fuel or improper RTV sealant.
Ensure the installed PROM and/or PCM is correct for that particular vehicle. Check with dealer for latest application information.
Check for faulty ECT sensor (engine coolant temperature).
Use scan tester to ensure vehicle speed sensor reading matches actual vehicle speed.
Check A/C system operation.
Check charging system voltage.
Check power steering operation.
Check for faulty automatic transmission operation.
Check valve timing.
Check for excessive fuel additives.
Check for improper or worn camshaft.
Check engine compression.
Check for restricted exhaust system.
Check if engine is operating in power management mode (if equipped).
Check for faulty or restricted throttle body.
Check for sticking or slaking throttle cable.